Organic Chemistry I: Course Syllabus and Topic Overview

Introduction

This syllabus outlines the main topics and schedule for a college-level Organic Chemistry I course. The course covers foundational concepts, molecular structures, reaction mechanisms, and stereochemistry, providing students with a comprehensive understanding of organic molecules and their behavior.

Course Schedule and Topics

Main Topics and Subtopics

1. Introduction to Organic Chemistry

Organic chemistry is the study of carbon-containing compounds, their properties, structures, and reactions. This section introduces basic concepts essential for understanding molecular behavior.

• Bonding: Types of chemical bonds (covalent, ionic), electron sharing, and molecular stability.

• Formal Charge: Calculation of charge on atoms within molecules using electron counting.

• Lewis Structures: Representation of molecules showing all valence electrons.

• Hybrid Orbitals: Mixing of atomic orbitals to form new hybrid orbitals (e.g., sp3, sp2, sp).

• Bond Angles: Geometric arrangement of atoms around a central atom, determined by hybridization.

• Example: Methane () has tetrahedral geometry with bond angles of .

2. Intermolecular Forces and Functional Groups

Understanding intermolecular forces and functional groups is crucial for predicting molecular interactions and reactivity.

• Intermolecular Forces: Includes hydrogen bonding, dipole-dipole interactions, and London dispersion forces.

• Functional Groups: Specific groups of atoms within molecules that determine chemical reactivity (e.g., alcohols, ketones, carboxylic acids).

• Alkane Reactions: Reactions involving saturated hydrocarbons, such as combustion and substitution.

• Nomenclature (IUPAC): Systematic naming of organic compounds according to international standards.

• Example: Ethanol () contains a hydroxyl functional group.

3. Conformational Analysis and Cycloalkanes

Conformational analysis explores the spatial arrangement of atoms in molecules and their energy differences. Cycloalkanes are ring-shaped hydrocarbons with unique conformational properties.

• Straight Chain Conformational Analysis: Examines different spatial arrangements (rotamers) of open-chain molecules.

• Newman Projections: Visual representation of conformations along a carbon-carbon bond.

• Cycloalkanes: Saturated hydrocarbons arranged in rings (e.g., cyclopentane, cyclohexane).

• Cyclohexane Chair Conformation: The most stable conformation of cyclohexane due to minimized steric strain.

• Substituted Cyclohexanes: Analysis of axial and equatorial positions for substituents on cyclohexane.

• Example: The chair conformation of cyclohexane minimizes torsional and steric strain.

4. Reaction Mechanisms: Combustion and Chain Reactions

This section covers the mechanisms of organic reactions, focusing on combustion and chain reactions, as well as the energy changes involved.

• Combustion of Methane: Complete oxidation of methane to carbon dioxide and water. Equation:

• Chain Reactions: Reactions where reactive intermediates propagate the reaction sequence.

• Energy and Kinetics: Study of reaction rates and energy profiles.

• Transition Energy: Energy required to reach the transition state in a chemical reaction.

• Example: Free radical halogenation of alkanes proceeds via a chain reaction mechanism.

5. Stereochemistry

Stereochemistry examines the spatial arrangement of atoms in molecules and its impact on chemical properties and reactivity.

• Optical Rotation: Measurement of the rotation of plane-polarized light by chiral molecules.

• R/S Nomenclature: System for assigning absolute configuration to chiral centers.

• Enantiomers: Non-superimposable mirror images of chiral molecules.

• Diastereomers: Stereoisomers that are not mirror images.

• Fischer Projections: Two-dimensional representation of three-dimensional molecules.

• E/Z Isomers: Geometric isomers based on the relative positions of substituents around a double bond.

• Example: Lactic acid has two enantiomers: (R)-lactic acid and (S)-lactic acid.

6. Nucleophilic Aliphatic Substitution and Alkyl Halides

Nucleophilic substitution reactions are fundamental in organic chemistry, involving the replacement of a leaving group by a nucleophile. Alkyl halides are common substrates for these reactions.

• Nucleophilic Aliphatic Substitution: Includes and mechanisms. rate law: rate law:

• Alkyl Halides: Organic compounds containing halogen atoms bonded to an alkyl group.

• Example: Chloromethane () undergoes substitution with hydroxide ion to form methanol.

Exams and Review

• Exam 1: Covers Chapters 1-2 (Bonding, Functional Groups, Nomenclature).

• Exam II: Covers Chapters 3-5 (Conformational Analysis, Stereochemistry).

• Final Exam: Comprehensive, covering all course topics.

• Review Sessions: Scheduled before the final exam for comprehensive review.

Additional info:

• Some dates are reserved for holidays and lab final, which are not detailed in the syllabus.

• Students are encouraged to consult the university handbook and support resources for further information.